YF-17 — The Cobra Survivors

For many, the YF-17 Cobra is a little-known footnote in late 20th
century military aircraft history. But its bloodlines developed
into two very important front-line Navy jets, one of which is
just starting its long career. To begin this story, we have to
rewind to the mid- and late-1960's. Northrop was doing a good
business supplying F-5 jets to the free world. The F-5A Freedom
Fighter was a
small, simple aircraft that was easy to fly, easy to maintain,
and did its job in a cost-effective manner. Northrop came to
the conclusion that there would be a global market for an up-rated
version of the F-5 that could fly Mach 2. This plane was called
the P-530.

The P-530 program was unveiled in early 1971. While it was a
capable aircraft, there were no buyers. To make matters worse,
the USAF was afraid of the P-530, thinking that it could cause
problems for the F-15 Eagle program. The P-530 program stumbled
since foreign nations were not going to buy a plane that the USAF
did not use. The F-15 itself was in flux given that the Soviets
unveiled the MiG-25, which could hit Mach
2.8, faster than any front-line western jet. As a result, the
F-15 was enlarged to carry bigger engines, more fuel, longer range
radar, and heavier weapons. That made the F-15 price that
much more expensive.

The growth of the F-15 turned out to be an opportunity in disguise.
The F-15 was now so expensive that the USAF could not afford to equip
all of its squadrons. The Pentagon came up with the concept of a smaller
and less expensive Lightweight Fighter Program. Eventually, the nod was
given to General Dynamics to build two YF-16 demonstrators, while Northrop
would build two YF-17s based on the P-530 (now called the P-600). The
Air Force would fly the prototypes head to head and pick a winner.

Both the YF-16 and YF-17 performed well. The YF-17 became the first
USAF aircraft to break the sound barrier in level flight without using
afterburners. While the YF-17 outperformed the YF-16 in many areas,
the YF-16 used a proven engine, it had longer range, and was less
expensive. As a result, the YF-16 won the contest, and went on to
be produced in large numbers as the Fighting Falcon. The two YF-17
were sent to NASA, which used them for research for a few years
before retiring the two prototypes.

That was not, however, the end of the story. The US Navy needed an
airplane to replace the carrier-based F-4 Phantom II, A-6 Intruder,
and A-7 Corsair II. When the design program floundered, the main
competitors were ordered to look at the aircraft from the Lightweight
Fighter Program. The Navy preferred two engines when flying over
open water, so the F-16 was not a choice. Northrop determined that
they could adapt the YF-17 design to naval use by refining the design
and beefing up the landing gear. Northrop teamed up with McDonnell
Douglas and submitted a proposal to the US Navy. The proposal was
accepted, and the F-18 program was born.

As the Hornet, McDonnell Douglas, now Boeing, produced the F/A-18 in
large numbers. First came
the A model, a single seat, and the two seat B. A second version
followed, the single seat C and two seat D. Over time, the Navy
became aware of problems with the Hornet, namely, short range and
light bomb load. A new generation of Super-Hornets were deployed,
F-18 E and F models that are about 30 percent larger than the
original Hornet, and the Cobra it descended from.